A variable speed playback method and apparatus is provided. The variable speed playback apparatus includes a transfer unit for moving a recording medium, a controller for controlling the transfer unit so as to repeatedly perform a fast transfer operation for moving the recording medium at a high speed and a normal playback operation for playing back the data of the recording medium at a normal playback speed after the fast transfer operation, and a restoring unit for reconstructing data, which is read from the recording medium during each period of the normal playback operation, to at least one picture of display data, thereby easily implementing variable speed playback without increasing the cost or structural complication of products.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A variable speed playback method for helical scanning and playing back digital data stored in a recording medium, the method comprising the steps of: (a) performing a fast transfer operation on the recording medium in response to a variable speed mode; and (b) playing back data stored in the recording medium at a normal playback speed after the fast transfer operation, wherein the step (a) of performing a fast transfer operation and the step (b) of playing back data stored in the recording medium at a normal playback speed are repeatedly performed, thereby realizing variable speed playback; wherein the data used for the variable speed playback is extracted from normal playback data stored in the recording medium.
2. The method of claim 1 , wherein, in the step (a), a speed of the fast transfer operation is fixed to a predetermined multiple-speed and a time period of the fast transfer operation is controlled in proportion to the multiple-speed of the variable speed mode.
3. The method of claim 1 , wherein, in the step (a), a time period of the fast transfer operation is fixed to a predetermined value and a speed of the fast transfer operation is varied in response to the variable speed mode.
4. The method of claim 3 , wherein, in the step (a), the speed of the fast transfer operation is adaptively controlled according to a desired multiple-speed and a time period of the normal playback operation.
5. The method of claim 1 , wherein, in the step (b), at least one picture is normally played back during each period of the normal playback operation.
6. The method of claim 1 , wherein the digital data has a Moving Picture Experts Group (MPEG) structure.
7. The method of claim 6 , wherein, in the step (b), at least one intra picture is extracted and normally played back during each period of the normal playback operation.
8. The method of claim 7 , wherein the period of the normal playback operation is adaptively controlled starting from a time point when the intra picture is extracted.
9. The method of claim 6 , wherein, in the step (b), at least one piece of group of picture (GOP) data is extracted and normally played back during each period of the normal playback operation.
10. The method of claim 1 , wherein the variable speed mode is selected by a user interface.
11. A variable speed playback apparatus for helically scanning and playing back digital data stored in a recording medium, the apparatus comprising: a transfer unit for moving the recording medium; a controller for controlling the transfer unit so as to repeatedly perform a fast transfer operation for moving the recording medium at a high speed and a normal playback operation for playing back the data of the recording medium at a normal playback speed after the fast transfer operation, thereby realizing variable speed playback; and a restoring unit for reconstructing data, which is read from the recording medium during each period of the normal playback operation, to at least one picture of display data; wherein the data used for the variable speed playback is extracted from normal playback data stored in the recording medium.
12. The apparatus of claim 11 , wherein the controller generates a variable speed playback control signal to repeat a period of the fast transfer operation, wherein the period depends on a multiple-speed, a transition period which is required for transition from the fast transfer operation to the normal playback operation, and a period of the normal playback operation; and provides the variable speed playback control signal to the restoring unit.
13. The apparatus of claim 11 , wherein the controller fixes a speed of the fast transfer operation to a predetermined multiple-speed and controls a time period of the fast transfer operation in proportion to a multiple-speed of the variable speed mode.
14. The apparatus of claim 11 , wherein the controller fixes a time period of the fast transfer operation to a predetermined value and varies a speed of the fast transfer operation in response to the variable speed mode.
15. The apparatus of claim 14 , wherein the controller adaptively controls the speed of the fast transfer operation according to a desired multiple-speed and a time period of the normal playback operation.
16. The apparatus of claim 11 , wherein the restoring unit normally plays back at least one picture during each period of the normal playback operation.
17. The apparatus of claim 11 , wherein the digital data has a Moving Picture Experts Group (MPEG) structure.
18. The apparatus of claim 17 , wherein the restoring unit extracts and normally plays back at least one intra picture during each period of the normal playback operation.
19. The apparatus of claim 18 , wherein the restoring unit provides a detection enable signal to the controller when an intra picture is extracted during the period of the normal playback operation, and the controller uses the detection enable signal as a reference signal for controlling the transfer unit.
20. The apparatus of claim 19 , wherein the controller adaptively controls the period of the normal playback operation according to a multiple-speed of the variable speed mode in response to the detection enable signal.
21. The apparatus of claim 17 , wherein the restoring unit extracts and normally plays back at least one piece of group of picture (GOP) data during each period of the normal playback operation.
22. A variable speed playback method for playing back digital data stored in a recording medium, the method comprising the steps of: (a) performing a fast data retrieval operation on the recording medium in response to a variable speed mode; and (b) playing back data stored in the recording medium at a normal playback speed after the fast data retrieval operation, wherein the step (a) of a fast data retrieval operation and the step (b) of a normal playback operation are repeatedly performed, thereby realizing variable speed playback; wherein the data used for the variable speed playback is extracted from normal playback data stored in the recording medium.
23. The method of claim 22 , wherein the variable speed playback is selected by a user interface.
24. The method of claim 22 , wherein, in the step (a), a speed of the fast data retrieval operation is fixed to a predetermined multiple-speed and a time period of the fast data retrieval operation is controlled in proportion to the multiple-speed of the variable speed mode.
25. The method of claim 22 , wherein, in the step (a), a time period of the fast data retrieval operation is fixed to a predetermined value and a speed of the fast data retrieval operation is varied in response to the variable speed mode.
26. The method of claim 25 , wherein, in the step (a), the speed of the fast data retrieval operation is adaptively controlled according to a desired multiple-speed and a time period of the normal playback operation.
27. The method of claim 22 , wherein at least one picture is normally played back during the normal playback operation.
28. The method of claim 22 , wherein at least one intra picture of a data compression structure is extracted and normally played back during each period of the normal playback operation.
29. A variable speed playback apparatus for playing back digital data stored in a recording medium, the apparatus comprising: a controller for controlling a data retrieval unit so as to repeatedly perform a fast data retrieval operation for accessing the recording medium at a high speed and a normal playback operation for playing back the data of the recording medium at a normal playback speed after the fast data retrieval operation, thereby realizing variable speed playback; and a restoring unit for reconstructing data, which is read from the recording medium during each period of the normal playback operation; wherein the data used for the variable speed playback is extracted from normal playback data stored in the recording medium.
30. The apparatus of claim 29 , wherein the controller generates a variable speed playback control signal to repeat a period of the fast data retrieval operation, a transition period which is required for transition from the fast data retrieval operation to the normal playback operation, and a period of the normal playback operation; and provides the variable speed playback control signal to the restoring unit.
31. The apparatus of claim 29 , wherein the controller fixes a speed of the fast data retrieval operation to a predetermined multiple-speed and controls a time period of the fast data retrieval operation in proportion to a multiple-speed of the variable speed mode.
32. The apparatus of claim 29 , wherein the controller fixes a time period of the fast data retrieval operation to a predetermined value and varies a speed of the fast data retrieval operation in response to the variable speed mode.
33. The apparatus of claim 32 , wherein the controller adaptively controls the speed of the fast data retrieval operation according to a desired multiple-speed and a time period of the normal playback operation.
34. The apparatus of claim 29 , wherein at least one picture is normally played back during the normal playback operation.
35. The apparatus of claim 29 , wherein, at least one intra picture of a data compression structure is extracted and normally played back during each period of the normal playback operation.
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December 15, 1999
May 25, 2004
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